Theresa May has spoken publicly about the sacking of Gavin Williamson for the first time.
In an interview with ITV News, the Prime Minister said it had been a "difficult decision" to remove Williamson from his post as defence secretary.
The cabinet minister was fired on Wednesday, after "compelling evidence" emerged that he was responsible for leaking details from a National Security Council meeting to a newspaper.
"This was not about what was leaked, it was about where it was leaked from. It was the importance of the question of trust around that NSC table," Mrs May said.
And when asked if she was convinced Gavin Wiliamson was the source of the leak, she replied: "I took the decision that I did, and that was the right decision."
However, Mr Williamson maintains he is innocent.